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Solve (sec (x))^2 + 2tan(x) = 0

Using the trigonometric identity: (sec(x))^2 = (tan(x))^2 + 1 we get to (tan(x))^2 + 2tan(x) + 1 = 0. We can express this result as the multiplication of 2 equal factors arriving at (tan(x) + 1)^2 = 0. This ...
LL
Answered by Lina L. • Maths tutor
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Describe the process of Eutrophication.

Excess nitrates and phosphates are water soluble and enter rivers/lakes/waterway due to leaching.Algae in the water use the increased level of ions for growth. This is called Algal bloom.Build up of algae on...
JU
Answered by Junaid U. • Biology tutor
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Describe how low blood water levels are controlled in the human body. (5 marks)

Changes in blood water levels are detected by the hypothalamus through the negative feedback mechanism in homeostasis (2 marks). The pituitary gland releases anti-diuretic hormone into the bloodstream as a r...
RJ
Answered by Rehan J. • Biology tutor
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Genetic engineering can be used to modify the genome of an organism to express desirable characteristics. Outline the steps of producing a recombinant DNA molecule.

The steps are as follows:The desired gene is isolated by 'cutting' it out using a restriction enzyme. The same restriction enzyme is then used to 'cut' a vector (plasmid or virus). These can either be left a...
MZ
Answered by Marium Z. • Biology tutor
3009 Views

How do I write a compelling descriptive essay question for English Language paper 1

Often students find the narrative choice in the 40 Mark question to be preferable. However it is possible that the exam will feature a choice between 2 descriptive questions, (therefore omitting a narrative ...
SW
Answered by Samuel W. • English tutor
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